Jacksonville, colloquially known as Jax, is located on the Atlantic coast of northeastern Florida. It serves as the county seat of Duval County, with which it consolidated in 1968. This consolidation significantly expanded the city's boundaries to 900 square miles and increased its official population by incorporating most of the county's residents.
As the most populous city proper in Florida, Jacksonville has a population of 949,611 according to the 2020 U.S. census. It ranks as the tenth-most populous city in the United States and is the largest city in the Southeast. Additionally, Jacksonville is the largest city by total area, including both land and water, in the contiguous United States.
The surrounding Jacksonville metropolitan area exceeds 1.76 million residents. This region ranks as the fourth-largest metropolitan area in Florida and the 38th-largest in the United States.